I regret to admit that my approach to oiling the struts has not improved their operation. (Struts, not tailgate hinges; which did respond to WD40).
I intend to use some silicone spray and hopefully that will cure the uneven opening.
(I am considering disconnecting the linkage to test the motor response, but without a real load I am not sure the test is meaningful.)
For those with deep pockets, my local Alphard friendly main dealer advises me that the K type units, as fitted to my Alphie, are still available..
Great news ? Not really !
Close to £200 each, but genuine Toyota OEM.
I confess, I am so irritated by the juddering I may speak nicely to Santa.